Dental appliance.



w. T. LYON.

DENTAL APPLIANCE.

APPUCATION FILED APR. 26, 1918.

1,283,2Q0. Patented Oct. 29, 1918.

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DENTAL nrrrmlvon.

To all whom itmag concern:

:Be itknown-that I, WlLLIAM T. LYON, a citizen of. the United-States, residing at Portland,iri the county of Multnomah and State of O regon, have invented new and useful Improvements in Dental Appliances, of which the following is a specification.

-My present improvements'have reference to that type-of -fdental"appliance generally disclosed in Patent #682,098, 1 granted to me September 3,1901, designedfor making the matrix; and shaping metal blanks into tooth'crowns, and in which is-included a matrix and crownforming meanscomprisingwseparable members adapted to be conveniently and quickly assembled to provide amatrixv forming chamber and asplitproducing member adapted to fit within the pouring or matrix forming chamber whereby to finish thematrix into two half sectionscapable of being separated for the ready remova-l of the tooth formed.

My present invention has particular referenceto-certain improved details' of construction of the matrix forming chamber, and

the matrix splitting means, all of which will be hereinafter fully explained, specifically pointed out in the appended claims and illustrated in the accompanying drawing, in which Figure 1 is a vertical section of my improved dental appliance, thesame being in condition ready to receive the matrix forming material, the split forming member being in position for forming the split cavity in the formed matrix.

Fig. 2 is a perspective view of the formed matrix and the splitting member.

Fig. 3 is a vertical section of my improved dental appliance, and indicates the matrix as having been formed thereby.

Fig. 4 is a similar view of the appliance, the same being shown in position for forming the metallic tooth crown.

Fig. 5 is a view similar to Figure l and indicates the tooth crown as having been completed.

In my present construction of dental appliance, the body portion proper comprises a single base or forming member 1, one end of which is formed with a matrix shaping chamber 10, whose inner end merges with a central vertical bore 11 that extends through the other end of the base, as is clearly shown in Fig. 1 and 3.

2 designates, What I term, the base pin Specification of Letters Patent.

Patented one as, rare.

App1icationfi1edApri126, 191s. seriaina'zsaoil;

or tootlrholder and inmy present appliance, the said pin has a socket20 into which, when the parts are assembled to shape the matrix, is-received wax, or other adhesive material, 21 for holding the tooth form (3 in place during the operation of pouring.

\ The pin 2 fits intothe central bore 11 and is ofsuch lengtlrthat it rests on the benclrbase- 9,: with its upper end projected into the bottom of the matrix chamber.

In lily-present construction of dental appliance, the splitting means also serves to form a crevice in the top'surface of the matrix as the latter is being cast and the said meansin my present case consists of'a split spring metal shank 7 adaptedfor being projectedinto a socket 12 in the chambered end of the base 1, the springof the said shank providing for holding the shank at different vertical and lateral adjustments with reference to-themzatrix being formed, the reason for which will presently appear.

7O designates a laterally extended arm integral with the shank 7, the outer end of which terminates in a splitting head 71 that includes a wedge shaped portion 72 which extends down from the head 7 0 and in parallelism with the shank 7 By reason of the peculiar shape of the splitting means, the wedge shaped portion 72, when the parts are adjusted for pouring the matrix, can be set to project high or low into the matrix chamber and at such angle, across the said chamber, as the particular shape of the tooth form or model may determine.

From the foregoing description taken in connection with the drawing, the construction, the manner of use and the advantages of my present invention will be readily understood by those skilled in the art to which it relates.

WVhen the parts are assembled, as in Fig. 1, the wedge portion 72 being projected below the top lines of the matrix chamber 10, forms a crevice w in the matrix (see Figs. 2, 4 and 5) and the molten metal as it pours onto the tooth form or plaster model heats said model and expels such moisture as may be present in the said plaster model.

After the matrix has been shaped, as shown in Fig. 2, the splitting device is disengaged from the socket 12, the pin 2 is pulled out, the base 1 being concaved, as at 1?, to permit of readily gripping the said p111.

crevice a: and tapping the head 71 with a hammer which will cause the break along the lines indicated 1n Fig. 2.

The tooth form removed, the two sections of the matrix are closed together and replaced into the matrix chamber and the base 1, with the two-part matrix therein, is then turned upside down on the bench base 9, as in Fig. 4. p

The crown disk 4: and the yielding material are then placed into the bore 11 and forced down to engage with the matrix, it being understood that by proper manipulation of the tamping bar, the crown is finally shaped as shown in Fig. 5, after which the wax is again removed, and the sections thereof separated from the completed crown.

What I claim is 1. In a dental appliance of the character described and an open top matrix forming mold, a member adapted to overhang and project down into the open top of the mold to produce a splitting crevice in the top of the matrix formed in the mold.

2. In a dental appliance of the character described, a matrix forming mold, a member adapted to overhang and project down into the mold to produce a splitting crevice in the top of the matrix formed in the mold, means for supporting said crevice producing member at different vertical and lateral positions with respect to the matrix to be formed in the mold. i i q 3. In adental appliance of the character described, a matrix forming mold, a member adapted to overhang and project down into the mold to produce a splitting crevice in the top of the matrix formed in the mold, the said member-including a tamping head provided with a wedge shaped pendent portion and a stem, the mold having a socket at the pouring end for receiving the said stem.

4. In a dental appliance of the character described, a matrix forming mold, a member adapted to overhang and project down into the mold to produce a splitting crevice in the top of the matrix formed in the mold, the said mold having a matrix forming chamber at one end, a concavity in the other end, a central bore connecting the chamber and the cavity, a base piece adapted for being held in the bore with one end projected into the matrix forming chamber, the said projecting end having a socket. for receiving adhesive material for holding a tooth form thereon.

WILLIAM T. LYON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents,

Washington, D. 0. i 

